Grassy i think is the answer if you were asking for the Adjective in "grassy slope" it'd be grassy
Sound effects were originally created and recorded for Horror movies to give a more dramatic feel that will start to grab you attention for plays sound affects were mostly used to make the audience more interested in to what they were watching, Most sound affects now are mostly music especially in action movies or car racing movies to make it even more dramatic than it already it is can you imagine a movie or play without sound affects or movies it's pretty weird and in the early 1900 before there was no audio in movies "Silent films" they used sound affects and music so they won't bore the audience.
Yes, it could've ended differently if the two families came to an understanding with each other. This would've changed the fact that Romeo and Juliet die, since you know, they were trying their best to get married secretly in fear that their families would continue fighting (maybe kill someone else).